That is a bit of a mistake to say the least.
I wonder if the tyres have been mounted on the wrong wheels, or the entire wheels are on the wrong corners.
Either way with the wrong tyres/wheels on the wrong place and probably tyre directions wrong, your car must have been a dog to drive.
Does the car run straight when you let the steering wheel find its centre?
No wonder the tyres are worn badly.
After 7 months I wonder how the dealer will deal with this.
Best of luck.